#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main()
{
    float h, r;
    scanf("%f %f", &h, &r);
    float v = 3.14 * h * r * r / 1000;
    int caps = 10 / v;
    10 / v == caps ? printf("%d", caps) : printf("%d", caps + 1);
    return 0;
}
